I've searched an searched and couldn't find a how to inventory this app's custom location /Library/Application Support/Microsoft/MAU2.0/
Here's how I did it:
1. Add this path to: Settings > Computer Management > Inventory Collection
2. This path should be queried for the Applications location for a computer
3. Now you should be able to create anything like a Smart Group to query this app
Application Title HAS Microsoft AutoUpdate
Note: It took a few days for me to notice this custom path showing up in the Inventory page for our Computers. As I write this our server is on v.10.9.0-t1544463445
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